ERK (MAPK) does not phosphorylate tau under physiological conditions in vivo or in vitro.

TitleERK (MAPK) does not phosphorylate tau under physiological conditions in vivo or in vitro.
Publication TypeJournal Article
Year of Publication2015
AuteursNoël, A, Poitras, I, Julien, J, Petry, FR, Morin, F, Charron, J, Planel, E
JournalNeurobiol Aging
Volume36
Issue2
Pagination901-2
Date Published2015 Feb
ISSN1558-1497
KeywordsAlzheimer Disease, Animals, Cells, Cultured, Humans, Hyperthermia, Induced, Hypothermia, Induced, In Vitro Techniques, MAP Kinase Signaling System, Mice, Inbred C57BL, Mice, Knockout, Mitogen-Activated Protein Kinase Kinases, Molecular Targeted Therapy, Phosphorylation, tau Proteins
Abstract

Alzheimer's disease is characterized by the deposition of intracellular aggregates of hyperphosphorylated tau protein. Tau hyperphosphorylation has been attributed in part to the deregulation of kinases and phosphatases activities. Extracellular signal regulated-kinases 1/2 (ERK1/2) were reported to be activated in the first stages of Alzheimer's disease and were proposed as a potential therapeutic target. However, although the phosphorylation of tau by ERK1/2 has been demonstrated in cell-free system, it remains controversial in vivo. Here, we showed that pharmacologic inhibition of ERK1/2 in mice and SH-SY5Y cells did not reduce basal levels of phospho-tau or hypothermia-induced tau hyperphosphorylation. We also found that activating ERK1/2 by hyperthermia did not correlate with increased tau phosphorylation. Finally, ERK1/2 was inhibited, but tau phosphorylation was not altered in Mek1-/- mice. In conclusion, these results do not support the involvement of ERK1/2 in tau phosphorylation under physiological conditions.

DOI10.1016/j.neurobiolaging.2014.11.005
Alternate JournalNeurobiol. Aging
PubMed ID25491074